/* $OpenBSD: linux_signal.c,v 1.2 1996/04/17 05:23:59 mickey Exp $ */ /* $NetBSD: linux_signal.c,v 1.10 1996/04/04 23:51:36 christos Exp $ */ /* * Copyright (c) 1995 Frank van der Linden * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project * by Frank van der Linden * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define sigemptyset(s) bzero((s), sizeof(*(s))) #define sigismember(s, n) (*(s) & sigmask(n)) #define sigaddset(s, n) (*(s) |= sigmask(n)) #define linux_sigmask(n) (1 << ((n) - 1)) #define linux_sigemptyset(s) bzero((s), sizeof(*(s))) #define linux_sigismember(s, n) (*(s) & linux_sigmask(n)) #define linux_sigaddset(s, n) (*(s) |= linux_sigmask(n)) int bsd_to_linux_sig[] = { 0, LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL, LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE, LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, 0, LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG, LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD, LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU, LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH, 0, LINUX_SIGUSR1, LINUX_SIGUSR2, }; int linux_to_bsd_sig[] = { 0, SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT, SIGBUS, SIGFPE, SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2, SIGPIPE, SIGALRM, SIGTERM, 0, SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU, SIGURG, SIGXCPU, SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, SIGIO, 0, 0, }; /* linux_signal.c */ void linux_to_bsd_sigset __P((const linux_sigset_t *, sigset_t *)); void bsd_to_linux_sigset __P((const sigset_t *, linux_sigset_t *)); void linux_to_bsd_sigaction __P((struct linux_sigaction *, struct sigaction *)); void bsd_to_linux_sigaction __P((struct sigaction *, struct linux_sigaction *)); /* * Ok, we know that Linux and BSD signals both are just an unsigned int. * Don't bother to use the sigismember() stuff for now. */ void linux_to_bsd_sigset(lss, bss) const linux_sigset_t *lss; sigset_t *bss; { int i, newsig; sigemptyset(bss); for (i = 1; i < LINUX_NSIG; i++) { if (linux_sigismember(lss, i)) { newsig = linux_to_bsd_sig[i]; if (newsig) sigaddset(bss, newsig); } } } void bsd_to_linux_sigset(bss, lss) const sigset_t *bss; linux_sigset_t *lss; { int i, newsig; linux_sigemptyset(lss); for (i = 1; i < NSIG; i++) { if (sigismember(bss, i)) { newsig = bsd_to_linux_sig[i]; if (newsig) linux_sigaddset(lss, newsig); } } } /* * Convert between Linux and BSD sigaction structures. Linux has * one extra field (sa_restorer) which we don't support. */ void linux_to_bsd_sigaction(lsa, bsa) struct linux_sigaction *lsa; struct sigaction *bsa; { bsa->sa_handler = lsa->sa_handler; linux_to_bsd_sigset(&lsa->sa_mask, &bsa->sa_mask); bsa->sa_flags = 0; if ((lsa->sa_flags & LINUX_SA_ONSTACK) != 0) bsa->sa_flags |= SA_ONSTACK; if ((lsa->sa_flags & LINUX_SA_RESTART) != 0) bsa->sa_flags |= SA_RESTART; if ((lsa->sa_flags & LINUX_SA_ONESHOT) != 0) bsa->sa_flags |= SA_RESETHAND; if ((lsa->sa_flags & LINUX_SA_NOCLDSTOP) != 0) bsa->sa_flags |= SA_NOCLDSTOP; if ((lsa->sa_flags & LINUX_SA_NOMASK) != 0) bsa->sa_flags |= SA_NODEFER; } void bsd_to_linux_sigaction(bsa, lsa) struct sigaction *bsa; struct linux_sigaction *lsa; { lsa->sa_handler = bsa->sa_handler; bsd_to_linux_sigset(&bsa->sa_mask, &lsa->sa_mask); lsa->sa_flags = 0; if ((bsa->sa_flags & SA_NOCLDSTOP) != 0) lsa->sa_flags |= LINUX_SA_NOCLDSTOP; if ((bsa->sa_flags & SA_ONSTACK) != 0) lsa->sa_flags |= LINUX_SA_ONSTACK; if ((bsa->sa_flags & SA_RESTART) != 0) lsa->sa_flags |= LINUX_SA_RESTART; if ((bsa->sa_flags & SA_NODEFER) != 0) lsa->sa_flags |= LINUX_SA_NOMASK; if ((bsa->sa_flags & SA_RESETHAND) != 0) lsa->sa_flags |= LINUX_SA_ONESHOT; lsa->sa_restorer = NULL; } /* * The Linux sigaction() system call. Do the usual conversions, * and just call sigaction(). Some flags and values are silently * ignored (see above). */ int linux_sys_sigaction(p, v, retval) register struct proc *p; void *v; register_t *retval; { struct linux_sys_sigaction_args /* { syscallarg(int) signum; syscallarg(struct linux_sigaction *) nsa; syscallarg(struct linux_sigaction *) osa; } */ *uap = v; struct linux_sigaction *nlsa, *olsa, tmplsa; struct sigaction *nbsa, *obsa, tmpbsa; struct sys_sigaction_args sa; caddr_t sg; int error; sg = stackgap_init(p->p_emul); nlsa = SCARG(uap, nsa); olsa = SCARG(uap, osa); if (olsa != NULL) obsa = stackgap_alloc(&sg, sizeof(struct sigaction)); else obsa = NULL; if (nlsa != NULL) { nbsa = stackgap_alloc(&sg, sizeof(struct sigaction)); if ((error = copyin(nlsa, &tmplsa, sizeof(tmplsa))) != 0) return error; linux_to_bsd_sigaction(&tmplsa, &tmpbsa); if ((error = copyout(&tmpbsa, nbsa, sizeof(tmpbsa))) != 0) return error; } else nbsa = NULL; SCARG(&sa, signum) = linux_to_bsd_sig[SCARG(uap, signum)]; SCARG(&sa, nsa) = nbsa; SCARG(&sa, osa) = obsa; if ((error = sys_sigaction(p, &sa, retval)) != 0) return error; if (olsa != NULL) { if ((error = copyin(obsa, &tmpbsa, sizeof(tmpbsa))) != 0) return error; bsd_to_linux_sigaction(&tmpbsa, &tmplsa); if ((error = copyout(&tmplsa, olsa, sizeof(tmplsa))) != 0) return error; } return 0; } /* * The Linux signal() system call. I think that the signal() in the C * library actually calls sigaction, so I doubt this one is ever used. * But hey, it can't hurt having it here. The same restrictions as for * sigaction() apply. */ int linux_sys_signal(p, v, retval) register struct proc *p; void *v; register_t *retval; { struct linux_sys_signal_args /* { syscallarg(int) sig; syscallarg(linux_handler_t) handler; } */ *uap = v; caddr_t sg; struct sys_sigaction_args sa_args; struct sigaction *osa, *nsa, tmpsa; int error; sg = stackgap_init(p->p_emul); nsa = stackgap_alloc(&sg, sizeof *nsa); osa = stackgap_alloc(&sg, sizeof *osa); tmpsa.sa_handler = SCARG(uap, handler); tmpsa.sa_mask = (sigset_t) 0; tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER; if ((error = copyout(&tmpsa, nsa, sizeof tmpsa))) return error; SCARG(&sa_args, signum) = linux_to_bsd_sig[SCARG(uap, sig)]; SCARG(&sa_args, osa) = osa; SCARG(&sa_args, nsa) = nsa; if ((error = sys_sigaction(p, &sa_args, retval))) return error; if ((error = copyin(osa, &tmpsa, sizeof *osa))) return error; retval[0] = (register_t) tmpsa.sa_handler; return 0; } /* * This is just a copy of the svr4 compat one. I feel so creative now. */ int linux_sys_sigprocmask(p, v, retval) register struct proc *p; void *v; register_t *retval; { struct linux_sys_sigprocmask_args /* { syscallarg(int) how; syscallarg(linux_sigset_t *) set; syscallarg(linux_sigset_t *) oset; } */ *uap = v; linux_sigset_t ss; sigset_t bs; int error = 0; *retval = 0; if (SCARG(uap, oset) != NULL) { /* Fix the return value first if needed */ bsd_to_linux_sigset(&p->p_sigmask, &ss); if ((error = copyout(&ss, SCARG(uap, oset), sizeof(ss))) != 0) return error; } if (SCARG(uap, set) == NULL) /* Just examine */ return 0; if ((error = copyin(SCARG(uap, set), &ss, sizeof(ss))) != 0) return error; linux_to_bsd_sigset(&ss, &bs); (void) splhigh(); switch (SCARG(uap, how)) { case LINUX_SIG_BLOCK: p->p_sigmask |= bs & ~sigcantmask; break; case LINUX_SIG_UNBLOCK: p->p_sigmask &= ~bs; break; case LINUX_SIG_SETMASK: p->p_sigmask = bs & ~sigcantmask; break; default: error = EINVAL; break; } (void) spl0(); return error; } /* * The functions below really make no distinction between an int * and [linux_]sigset_t. This is ok for now, but it might break * sometime. Then again, sigset_t is trusted to be an int everywhere * else in the kernel too. */ /* ARGSUSED */ int linux_sys_siggetmask(p, v, retval) register struct proc *p; void *v; register_t *retval; { bsd_to_linux_sigset(&p->p_sigmask, (linux_sigset_t *)retval); return 0; } /* * The following three functions fiddle with a process' signal mask. * Convert the signal masks because of the different signal * values for Linux. The need for this is the reason why * they are here, and have not been mapped directly. */ int linux_sys_sigsetmask(p, v, retval) register struct proc *p; void *v; register_t *retval; { struct linux_sys_sigsetmask_args /* { syscallarg(linux_sigset_t) mask; } */ *uap = v; linux_sigset_t mask; sigset_t bsdsig; bsd_to_linux_sigset(&p->p_sigmask, (linux_sigset_t *)retval); mask = SCARG(uap, mask); bsd_to_linux_sigset(&bsdsig, &mask); splhigh(); p->p_sigmask = bsdsig & ~sigcantmask; spl0(); return 0; } int linux_sys_sigpending(p, v, retval) register struct proc *p; void *v; register_t *retval; { struct linux_sys_sigpending_args /* { syscallarg(linux_sigset_t *) mask; } */ *uap = v; sigset_t bs; linux_sigset_t ls; bs = p->p_siglist & p->p_sigmask; bsd_to_linux_sigset(&bs, &ls); return copyout(&ls, SCARG(uap, mask), sizeof(ls)); } int linux_sys_sigsuspend(p, v, retval) register struct proc *p; void *v; register_t *retval; { struct linux_sys_sigsuspend_args /* { syscallarg(caddr_t) restart; syscallarg(int) oldmask; syscallarg(int) mask; } */ *uap = v; struct sys_sigsuspend_args sa; linux_sigset_t mask = SCARG(uap, mask); linux_to_bsd_sigset(&mask, &SCARG(&sa, mask)); return sys_sigsuspend(p, &sa, retval); } /* * The deprecated pause(2), which is really just an instance * of sigsuspend(2). */ int linux_sys_pause(p, v, retval) register struct proc *p; void *v; register_t *retval; { struct sys_sigsuspend_args bsa; SCARG(&bsa, mask) = p->p_sigmask; return sys_sigsuspend(p, &bsa, retval); } /* * Once more: only a signal conversion is needed. */ int linux_sys_kill(p, v, retval) register struct proc *p; void *v; register_t *retval; { struct linux_sys_kill_args /* { syscallarg(int) pid; syscallarg(int) signum; } */ *uap = v; struct sys_kill_args ka; SCARG(&ka, pid) = SCARG(uap, pid); SCARG(&ka, signum) = linux_to_bsd_sig[SCARG(uap, signum)]; return sys_kill(p, &ka, retval); }